Calibration of weirs using unsteady flow

Bortoni, Edson C.; Rocha, Mariana Souza; Rodrigues, Marcelo A.S.; Laurindo, Bianca C.S.

doi:10.1016/j.flowmeasinst.2017.08.011

Cited by 8 publications

(3 citation statements)

References 24 publications

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“…The rated quantities of the hydraulic turbine are shown in Table 1. The water flow (Q) through the turbine is measured as the average of two different methods, described and referred to in main hydraulic machinery testing standards [62,63]. This procedure guarantees redundancy in this There is a movable diverter inside the tank, which allows the operation with two different upstream levels, named NM I and NM II .…”

Section: Experimental Testing Setupmentioning

confidence: 99%

“…This procedure guarantees redundancy in this important and difficult measurement. In the first method, water flow is calculated as a function of the measured spill height over the weir; the main dimensional characteristics are described in Table 2 [62]. The second technique for flow measurement is the Winter-Kennedy method.…”

Section: Experimental Testing Setupmentioning

confidence: 99%

“…The value of the flow at the turbine is the average of both measurements Q V and Q WK . k V and k WK are constants obtained from calibrations [62], while h V (m) and ∆h WK are the level over the weir and the differential pressure measured in turbine spiral casing.…”

Section: Experimental Testing Setupmentioning

confidence: 99%

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The Benefits of Variable Speed Operation in Hydropower Plants Driven by Francis Turbines

et al. 2019

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Climate change and environmental degradation has resulted in a reduction in water inflow at hydropower plants, as well as a decrease in reservoir levels. Existing hydropower plants suffer from water head reduction, mainly with decrease in efficiency of energy conversion in hydro turbines. This paper showcases the benefits of operations with variable speed in existing hydropower plants, when working at a lower water head than the rated one. Theoretical analyses and tests were performed in a special constructed laboratorial setup aiming at evaluating the amount of efficiency recovery with variable speed operation. Connection alternatives for a constant frequency grid and applications of the learned concepts in an existent hydropower plant are presented. The investigations were applied to the Furnas hydropower plant. The results point out that economic feasibility of the application can be achieved.

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Section: Experimental Testing Setupmentioning

confidence: 99%

Section: Experimental Testing Setupmentioning

confidence: 99%